Fuel cell graphitc composite flow field plate and its manufacturing method

A fuel cell and composite flow technology, applied in fuel cells, fuel cell parts, battery electrodes, etc., can solve the problem of high contact resistance between flow field plate and diffusion layer, high resistance of graphite/polymer flow field plate, high contact resistance, etc. problem, to achieve the effect of low cost, good gas barrier performance and low contact resistance

Inactive Publication Date: 2009-08-26
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the proportion of polymer in the composite material flow field plate is large, the injection molding process can be used, but due to the high polymer content, the bulk resistance of the graphite / polymer flow field plate is high, and the contact resistance with the diffusion layer is also high
When the proportion of graphite is large, the molding process can be used, but the polymer will be enriched on the surface of the flow field plate during the hot pressing process, and the flow field plate and the diffusion layer prepared by this method have high contact resistance

Method used

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  • Fuel cell graphitc composite flow field plate and its manufacturing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] 0.14g of phenolic resin containing 0.014g of curing agent hexamethylenetetramine and 1.66g of natural flake graphite are put into a high-speed universal pulverizer and mixed evenly. Put the uniformly mixed powder into a flat mold and heat it to 90°C, pressurize it to 50MPa, hold it for 2 minutes, then cool it to 40°C and demould it to obtain a 2.1mm thick graphite composite flow field plate middle layer prefabricated plate . Add a piece of flexible graphite paper with a thickness of 0.22mm equal to the surface area of ​​the prefabricated plate on both sides of the prefabricated plate in the middle layer, put them together in a mold with runners and heat to 150°C for 2 minutes at a constant temperature of 110MPa The thickness of the graphite composite flow field plate obtained by pressing down and forming is 2.48mm. The two surfaces of the graphite composite flow field plate are respectively composed of 10 ridges and 10 grooves, the width of the ridge is 1 mm, the groove wid...

Embodiment 2

[0015] 0.6 g of phenolic resin containing 0.06 g of six grade A tetramine as curing agent and 2.2 g of natural flake graphite are put into a high-speed universal pulverizer and mixed evenly. Put the uniformly mixed powder into a flat mold and heat it to 90°C, pressurize it to 50MPa, hold it for 2 minutes, then cool it to 40°C and demould it to obtain a 2.4mm thick graphite composite flow field plate middle layer prefabricated plate . Put a layer of expanded graphite particles with a mass of 0.05g on the bottom layer of the mold with a runner, then put the prefabricated plate on the expanded graphite particles, and then place a layer of expanded graphite particles with a mass of 0.05g on the prefabricated plate . The mold was heated to 150°C, held at a constant temperature for 2 minutes, and pressed at 70 MPa to obtain a graphite composite flow field plate with a thickness of 2.1 mm. The two surfaces of the graphite composite flow field plate are respectively composed of 10 ridges ...

Embodiment 3

[0017] Put 0.28g of polypropylene and 2.52g of natural flake graphite into a high-speed universal pulverizer and mix evenly. Put the mixed powder into a flat mold and heat it to 175℃, pressurize it to 50MPa, keep it for 3 minutes, and then cool to Demoulded at 60°C to obtain a prefabricated plate of the middle layer of the graphite composite flow field plate with a thickness of 2.2 mm. Add a piece of flexible graphite paper with a thickness of 0.3mm equal to the surface area of ​​the prefabricated plate on both sides of the prefabricated plate in the middle layer, put it into a mold with runners and heat it to 210°C, at a constant temperature for 5 minutes, and press at 100MPa to obtain graphite The thickness of the composite flow field plate is 2.6mm. The two surfaces of the graphite composite flow field plate are respectively composed of 10 ridges and 10 grooves, the width of the ridge is 1 mm, the groove width is 1 mm, and the groove depth is 0.8 mm. The test results of the per...

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Abstract

This invention discloses a graphite compound flow field board for fuel cell and manufacture method. On the wall of the flow field board there are fluid inlet, the fluid outlet and rib and channel forming flow field. The flow field is characterized in that it is formed by middle layer of graphite composite material and upper and lower surface layers of flexible graphite material that are compounded by sandwich layer. The preparation process includes: mix evenly electric conductive pellets and resin or polymer, put it in the mold to heat up, pressurize and maintain a certain time, the cool to draw mould to obtain sandwiched composite plate. Advantages: lower contact resistance, strong anti-corrosion ability, good electric conductivity and thermal conductivity, good gas barrier property, simple process and low cost.

Description

Technical field [0001] The invention relates to a fuel cell flow field plate material and a manufacturing method thereof, and belongs to the technical field of fuel cells. Background technique [0002] A fuel cell (PEMFC) is a power generation device that directly converts the chemical energy in fuel and oxidant into electrical energy. It has the advantages of high energy conversion rate, strong reliability, high mass-to-energy ratio, clean and easy to start. [0003] At present, the flow field plate materials used in fuel cells mainly include metal and graphite. The flow field plate of metal material has good electrical conductivity, heat conduction and gas barrier properties, and good machining performance makes the flow field processing technology simple. The disadvantage is that the cathode is prone to produce an oxide film, which leads to an increase in contact resistance with the diffusion layer and reduces battery performance; the anode is easily corroded, and the product ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/02H01M4/86H01M4/88H01M8/0297
CPCY02E60/50Y02P70/50
Inventor 王宇新李冬杰许莉
Owner TIANJIN UNIV
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